do not pass http.ResponseWriter as pointer to EnableCors (#1440)

router/middleware/cors.go

@@ -4,7 +4,7 @@ import (
 	"net/http"
 )
 
-// EnableCors enables the cors header on the responses.
-func EnableCors(w *http.ResponseWriter) {
-	(*w).Header().Set("Access-Control-Allow-Origin", "*")
+// EnableCors enables the CORS header on the responses.
+func EnableCors(w http.ResponseWriter) {
+	w.Header().Set("Access-Control-Allow-Origin", "*")
 }